Apparatus for drawing patterns from molds.



No. 658,973. Patented Oct. 2, I900.

J. H. B. BRYAN. APPARATUS FOR DRAWING PATTERNS FROM MULDS.

(Application filed Nov. 28. 1899.)

3 Shasta-*Shoet I.

(No Model.)

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Patented Oct. 2, I900.

J. H. B. BRYAN. I APPARATUS FOR DRAWING PATTERNS FROM MOLDS.

(Application filed Nov. 28, 1899.)

3 Shaats8haet 2.

(No Model.)

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No. 658,973. Patented Oct. 2, I900.

.1. B. BRYAN.

APPARATUS FOR DRAWING PATTERNS FROM MOLDS.

(Application filed Nov. 28, 1899.)

{No Model.) 3 Sheets-Sheet 3.

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71, J E/ 0 1 J? i I L 5 a: CL i l I L n ma norm-s PETERS 00., vucmumu,wnsmnnvcm u UNITED STAT S PATENT OFFICE.

JOHN H. B. BRYAN, OF BUFFALO, NEW YORK.

APPARATUS FOR DR AWING PATTERNS FROM MOLDS.

$PEGIFICATION forming part of Letters Patent No. 658,973, dated October2, 1900. Application filed November 28,1899. b'erial No. 738,549. \Nomodel.)

T0 at whom it may concern.-

Be it known that 1, JOHN H. B. BRYAN, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented new and useful Improvements in Apparatus for Drawing Patternsfrom Molds, of which the following is a speci fication.

This invention relates to an apparatus for drawing patterns out of sandmolds after the latter have been formed in the flasks. Heretoforepatterns have been withdrawn by hand from sand molds made in theordinary manner. In order to enable the pattern to be drawn by hand, itis necessary to loosen the pattern in the mold by rapping. When thepattern is large or deep or has little draft, considerable rapping isnecessary to loosen the pattern from the sand, whereby the mold isenlarged to a greater or less extent. In drawing the pattern by hand,especially when the pattern is large or intricate, the mold is liable tobe damaged by breaking off pieces here and there and otherwise. Theseimperfections of the mold have to be repaired by the inolder, whichrequires great skill and care and adds considerably to the cost of themold and so to the cost of producing the casting.

The object of my invention is the production of an apparatus by whichpatterns can be drawn from molds with ease and certainty and withoutdanger of damaging the mold, thereby reducing the cost of producing themold and producing molds which are closely in accord with the patterns.

My improved apparatus consists, essentially, of one or moresuction-holders, which are placed upon the pattern and from which theair is exhausted to attach them to the pattern and which are then raisedon a guide device to draw the pattern from the mold. The apparatus isprovided with various devices whereby these operations are performedwith ease and certainty and also with devices for carrying the patternto the desired place of deposit.

In the accompanying drawings, consisting of three sheets, Figure 1 is aside elevation, partly in section, of one form of my patternliftingapparatus. Fig. 2 is a top plan view of the same. Fig. 3 is a horizontalsection in line 3 3, Fig. 1. Fig. 4 is a vertical longitumediate andlower arms I) h dinal section, on an enlarged scale, of thepattern-holders and adjacent parts. Fig. 5 is a fragmentary verticalsection, on an enlarged scale, of the air-valve. Fig. 6 is a similarsection of the air-valve, taken at right angles to Fig. 5. Figs. 7 and 8are fragmentary transverse sections in lines 7 7 and 8 8, Fig. 4,respectively. Fig. 9 is a fragmentary horizontal section in line 9 9,Fig. 4. Fig. 10 is a fragmentary side elevation, partly in section, of amodification of my pattern-lifting apparatus. Fig. 11 is a fragmentarylongitudinal section, on an enlarged scale, of the patternholder andadjacent parts viewed in the same direction as Fig. 10. Fig. 12 is afragmentary transverse section in line 12 12, Fig. 11. Fig. 13 is avertical section of the air-valve which controls the vertical movementof the pattern-holder in the modified construction. Fig. 14. is asimilar section of this air-valve, taken at right angles to Fig. 13.

Like letters of reference refer to like parts in the several figures.

Referring to Figs. 1 to 9, A represents the molding-bench, upon whichthe molding-flask a is placed in the usual manner for molding thepattern in the sand.

B represents a horizontally-movable frame, which is arranged above themolding-bench and which consists, essentially, of an upright shaft 1),provided with an upper arm b, an intermediate arm b and a lower arm b,which project horizontally forward from the shaft, and an'nprightbrace-bar b connecting the outer ends of the intermediate and lowerarms. The upper arm I) is preferably bent and formed in one piece withthe shaft, while the intermediate and lower arms are made separate andfastened to said shaft. The upright shaft is journaled in bearings c a,so as to be capable of rocking, horizontally. These bearings are securedto a wall, post, or other stationary support 0 in rear of themoldingbench.

D represents an upright hollow lifting-rod, which is capable of slidingvertically in guides d d, arranged at the outer ends of the inter- Thisrod is raised and lowered by means of a bifurcated lever E, which ispivotally connected to the lifting-rod and-pivoted loosely at its rearend to the rock-shaft b by a transverse pin e, se-

cured to the shaft and passing through longitudinal slots in thebifurcations oftheleveiz.

The front end of the lever is preferably widened to form a handle e. Theweight of the hollow lifting-rod and the parts connected therewith isbalanced by a weighted arm F, pivoted at its rear end on the shaft oftherocking frame and connected at its front end with the lifting-rod byachain or other flexie ble connection f, which passes over aguidewheel fon the upper arm of the rocking frame.

G represents a three-way cock arranged 'at' the upper end of the hollowlifting-rod for either connecting the interior of the hollow rod withthe exhaust mechanism or breaking the vacuum in the rod byopeningwaaommunication between the interior of the rod. This cock haswith an air-exhaust device, and an upper.

branch or nipple 9 which opens into the at mosphere. The chain of thebalancing-lever can be conveniently connected with the 1101- low rodthrough the cock G by an open plug which is screwed into the uppernipple g? of this cock and provided with an eye, to which the chain isattached, as represented in Figs. 1, 5, and 6. The rotaryplug g of thecock is provided with an arm g, which is adapted to engage alternatelywith upper and lower stops or tappets h h as the lifting-rod is raisedand lowered. These tappets are adjustably secured to an uprightsupportingrod H, which depends from the front end of the upper arm ofthe rocking frame, as shown in Figs. 1, 2, and 6. When the liftingrod islowered, the arm of the valve strikes the lower tappet h and thevalve-plug is turned,- so as to connect the interior of the rod with theexhaust-tube g whereby the air is .eX-. hausted from the rod. During thelast part of the upward movement of the rod the arm of the valve strikesthe upper tappet h, whereby the plug of the valve is turned, so as tocut off the interior of the lifting-rod from the exhaust and connect theinterior of the, rod with the atmosphere, thereby breaking the vacuum inthe rod.

I represents two suction cups or holders,- which are supported from thelower end of the tubular lifting-rod in such manner that these holderscan be placed upon the pattern by lowering the rod and can be raisedwith the pattern by raising the rod. These suctionholders communicatewith the interior of the tubular lifting-rod, so that when these holdershave been placed upon the pattern the air can be exhausted from theseholders in order to cause the same to attach themselves firmly to thepattern. These holders are attached to a supporting-head J, which isconnected with the lower end of the lifting-rod by a.

flexible coupling K. The latter enables the two holders to tilt withreference to the rod,

similar material, which is clamped between the disk and the ring.

The stem of the sucti on cup or holder is provided at its upper endwitha horizontal supporting-arm tiwhich is arranged in an opening of thesupportinghead J. The supporting-arms of bothsuction-holders arearranged one upon the other orside byside and are secured .byclampingscrews 2'. suction-.holderscan be adjusted toward;or from-eachother, as the-sizev or form of the pattern may require. The lowerrportioniof the stem of each suction-holder is hollow'and connected byaflexible tube 2' with the interiorlof the h0ll0w-c0l1pling K. Thiscoupling consists,-preferably, of an upper annular diskor plate it,having a boss on its upper side,-which is securedtothe lo-werend of thelifting-rod, a smaller. lower annular disk or plate It, havinga nippleon its-lower side which is securedzby a coupling-stem k to the upper endof.the supporting-head J, and a flexible ring or annular plat-e ofrubberor other suitable material, arranged between the upperand lowerdisks and. secured with its outer edge to the margin of the upper diskand with, its iuneredge to the margin of the lower disk.

While the operator is molding the pattern in the flask the rocking frameis-turned to one side and the. suction-holders are raised to theirhighest position, tin which the exhaust iscut off by'the three-way cockfrom the hollow lifting-rod. After theoperator has finished moldingthepattern the rocking frameis swung forwardly, so that the suction-;holders.stand over the pattern. The operator now. depresses-thehand-lever, whereby the hollow rod and the holdingdevices are loweredand the cock is turned so as to connectthe exhaust with. the hollow rod,thereby exhausting. the-air from the suction-holdersand causing thelatter to attach themselves firmly to the pattern. The elasticbearing-rim of each holder permits the latter to adjust itself toanyslight irregularities in the surface of the pattern; butif aconsiderable unevenness exists the holding. devices tilt, by reason ofthe yielding coupling K, un-

til bothholders engage properly with the pattern. The yielding couplingbetween the holding device and the lifting-rod is especially usefulwhenlifting large patterns from the flask, in which case the holders arearranged at a considerable distance apart, whichrenders it difiicult toadjust ,theholders accurately. After the holders arefirmly Uponloosening these screws the attached to the pattern the operator raisesthe lifting-rod, whereby the pattern which is attached to the holders islifted from the mold in the flask. The last portion of the upwardmovement of the lifting-rod turns the three-waycock so as to cut off theexhaust from the suction-holders and place the latter in communicationwith the atmosphere, whereby the vacuum is broken and the pattern isreleased from the holders. In that case the operator takes hold of thepattern before the suction-holders release the same. The rocking framecarrying the holding devices is then swung to one side to clear thespace above the molding-flask and permit the operator to remove thefinished mold and prepare the next mold. to carry the pattern to oneside before it is released by the holders, he does not raise the rod sohigh that the suction is out 01f, but simply high enough to clear theflask. He then swings the frame and pat-tern to one side and raises therod fully when the pattern has reached the desired position.

The suction-holdersadaptthemselves easily to the upper surface of thepattern and attach themselves readily and firmly to the pattern at thepoints where they come in contact with the pattern without disturbingthe latter or the mold in which the pattern is embedded. The pattern isdrawn from the mold by a straight upward pull, which does not disturbthe mold to any appreciable extent and whereby injury to the mold isavoided, thus doing away with the necessity of completing or repairingthe mold by hand after the pattern has been drawn, whereby the cost ofmolding is greatly reduced, better molds are produced, and the timerequired for producing a mold is considerably lessened. The rapping ofthe mold required for detaching the pattern from the sand preparatory todrawing the pattern is inconsiderable and can be conveniently effectedby the following device.

M represents a two-armed rapping-lever, which is pivoted to thesupporting-head J by a pin m, which is secured by a clip m to the lowerside of the supporting-head, as shown in Figs. 1 and 7. Each arm of therappinglever is provided with a hammer m which extends laterallyunderneath the supportingarm of the adjacent suction-holder, as shown inFigs. 4, 8, and 9. The rapping-lever is provided on its upper side witha handle m whereby it may be rocked. After the holders are lowered uponthe pattern the rapping-lever is rocked a few times, so that itshammersstrike the arms of the holders alternately and vibrate the holders, andthrough the holders the pattern, thereby causing the latter to beloosened in the molding-sand.

In the modified construction of my apparatus shown in Figs. 10 to 14only one suctionholder is employed and the raising and lowering iseffected pneumatically instead of by hand. In this construction thehollow lift- If the operator desires ing-rod extends through a verticalcylinder N, which is secured to a horizontal rock-arm it. Thelifting-rod is provided with a piston n within the cylinder. The ends ofthe cylinder are connected by pipes 0 with a fourway cock 0, which isconnected with a flexible branch 0 of the exhaustpipe. This cock isturned by hand and so constructed that when turned in onedirection theupper end of the cylinder isplaced in comm unication with the exhaustand the other end of the cylinder is connected with the atmosphere, asshown in Fig. 13, thereby raising the piston and the parts connectedtherewith, as shown in Fig. 10. Upon reversing the fourway cook thelower end of the cylinder is connected with the exhaust and the upperend with the atmosphere, thereby lowering the piston and the partsconnected therewith.

The single suction-holder I can be connected directly with the lower endof the hollow lifting-rod by a rigid connection for instance, acoupling-pipe p-because with a single holder the elastic rim of theholder is usually sufficient to enable the holder to bear evenly on thepattern. In the holder shown in Figs. 10 to 12 the elastic rim q issecured directly to the supporting-disk q. The rapping-lever M, as shownin Figs. 10 to 12, is pivoted on a pin (1 extending through the pipe 19,and its hammers strike the under sides of arms g which project fromopposite sides of the pipe 17.

I claim as my invention 1. In an apparatus for drawing patterns frommolds, the combination with a horizontally-movable supporting-framehavinga vertical guide, of a hollow vertical lifting-rod arranged insaid guide and capable of vertical movement therein, a suction-headattached to the lower end of said rod and comm unicating therewith, anda suction-pipe connected with the upper portion of said rod,substantially as set forth.

2. In an apparatus for drawing patterns from molds, the combination witha supporting-frame capable of swinging horizontally about a verticalpivot and having at its free end a vertical guide, of a verticallifting-rod arranged in said guide and capable of vertical movementtherein, a suction-head attached to the lower end of said rod, and asuctionpipe connected with said head, substantially as set forth.

3. In an apparatus for drawing patterns from molds, the combination witha horizontally-movable supporting-frame havinga vertical guide, of avertical lifting-rod arranged in said guide and capable of verticalmovement therein, a suction-head attached to the lower end of said rod,asuction-pipe connected with said head,'and a counterbalancing devicemounted in said frame and connected with said lifting-rod,substantiallyas set forth.

4. The combination with an upright rod capable of vertical movement, anda suctionholder arranged below said rod, of a flexible couplingconnecting said holder with said rod, substantially as set forth.

5. The com bination with a hollow rod adapted to be placed incommunication with an exhaust, of a suction-holder, and a flexiblecoupling con necting said holder with said rod, substantially as setforth.

6. The combination with a hollow rod adapted to be placed incommunication with an exhaust, of a flexible coupling communicating withthe lower end of said rod, a supportinghead carried by said coupling, asuctionholder, attached to said head, and a flexible pipe connectingsaid holder with said coupling, substantially as set forth.

7. The combination with an upright rod capable of up-aud-down movement,of a suction-holder and a rapping device connected with the lower end ofsaid rod, substantially as set forth.

8. The combination with an upright rod capable of up-and-down movement,of a supporting-head arranged at the lower end of said rod, asuction-holder carried by said head, and a rapping device also carriedby said head, substantially as set forth.

9. The combination with an upright rod capable of up-and-down movement,of a suction-holder connected with the lower end of said rod, and arapping device carried by said rod and adapted to jar saidsuction-holder, substantially as set forth.

10. The combination with an upright rod capable of up-and-down movement,of a supporting-head connected with the lower end of said rod, asuction-holder attached to said head, and a rapping device also attachedto said head and adapted to jar said suctionholder, substantially as setforth.

11. The combination with an upright rod capable of up-and-down movement,of a supporting-head connected with the lower end of said rod,suction-holders provided with arms which are secured to said head, and arapping device pivoted to said head and adapted to strike said arms,substantially as set forth.

12. The combination with a supportingframe having a vertical guide, of avertical, hollow lifting-rod arranged in said guide and capable ofvertical movement therein, a suction-head attached to the lower end ofsaid rod, a three-way cock communicating with said rod above said headand provided with an actuating-arm, and stops arranged on said frame,one above the other, and receiving the actuating-arm of said cockbetween them,substantially as set forth.

13. The combination with a supportingframe having a vertical guide andcapable of vertical movement therein, of a vertical, hollow lifting-rodarranged in said guide and capable of vertical movement therein, asuction-head attached to the lower end of said rod, a three-way cockcommunicating with said rod above said head and provided with anactuating-arm, a vertical lifting-rod secured to said frame, and stopsadjustably secured to said rod, one above the other, and receiving theactuating-arm of said cock between them, substantially as set forth.

14. The combination with a hollow rod capable of up-and-down movementand carrying a suction-holder at its lower end, of a three-way cock atthe upper end of said rod, provided with a nipple for connection with anexhaust and with an air-inlet, a hollow plug secured to said inlet, anda counterbalance attached to said plug, substantially as set forth.

Witness my hand this 23d day of November, 1899.

JOHN H. B. BRYAN. Witnesses:

MARTIN L. CRAMER, T. J. HASSETT.

